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https://e-radiologia.org/2020/03/23/five-year-progression-of-emphysema-and-air-trapping-at-ct-in-smokers-with-and-those-without-chronic-obstructive-pulmonary-disease-results-from-the-copdgene-study/
Five-year Progression of Emphysema and Air Trapping at CT in Smokers with and Those without Chronic Obstructive Pulmonary Disease: Results from the COPDGene Study